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To an oven dried flask cooled under argon equipped with a stir bar was added 5-chloro-2-oxo-1-propylindolin-3-yl benzoate (0.08 grams, 0.24 mmol, 0.2 M in toluene). While stirring at 0° C. KHMDS (0.3 mL, 0.26 mmol, 0.87 M, purchased from Fisher Scientific) was added. After approximately fifteen minutes a solution of (1-benzoyl-1H-indol-3-yl)methyl benzoate (0.02 grams, 0.06 mmol, 0.3 M in anhydrous DMF (purchased from Fisher Scientific)) was added. The reaction continued to stir overnight. The next day the reaction was acidified with 0.1M HCl, diluted with ethyl acetate and the two layers were separated. The aqueous layer was salted out and washed twice more with ethyl acetate. The combined organic solution was dried with sodium sulfate, filtered and concentrated. Purification was done on a Teledyne ISCO with silica gel using a hexanes ethyl acetate gradient. This was followed by a subsequent reverse phase purification using Teledyne ISCO with a C18 column and a water with 0.1% formic acid, acetonitrile gradient. 43% yield. 1H-NMR δ 8.05 (bs, NH), 8.00 (d, 2H), 7.57 (t, 1H), 7.50 (d, 1H), 7.42 (t, 2H), 7.30 (d, 1H), 7.18 (m, 2H), 7.08 (m, 2H), 6.78 (d, 1H), 6.61 (d, 1H), 3.71 (d, 1H), 3.60 (m, 1H), 3.51 (d, 1H), 3.40 (m, 1H), 1.35 (m, 2H), 0.74 (t, 3H). Calculated mass for C27H23ClN2O3, 458.14. Observed 481.1 (M+Na).

1. customTo an oven dried flask
2. temperaturecooled under argon
3. customequipped with a stir bar
4. stirringto stir overnight
5. customthe two layers were separated
6. washwashed twice more with ethyl acetate
7. dry with materialThe combined organic solution was dried with sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customPurification
11. customThis was followed by a subsequent reverse phase purification